Adjusting and holding device



Jan. 6, 1948.

A. J. STEPANOFF ADJUSTING AND HOLDING DEVICE Filed Feb. 19, 1946mvENTbi? HI 5 ATI'ORNEY- Patented Jan. 6, 1348 UNITED STATES PATENTOFFICE me V Alexey- ,1. Stepanolf, Phillipsb u1;g, N. 5,, assignortolngcrsoll Rand "Company, New ijork, Y'.,

acorimoratiomofiNew Jersey Application February 19, 1946, Serial No.648,661

4 Claims.

This invention relates to centrifugal machines, as for example pumps,blowers, or the like, and more particularly to a device for adjustingand holding an impeller on a shaft.

One object of the invention is to facilitate the operation of placing animpeller in the correct assembled position on a shaft.

A further object is to enable an impeller to be conveniently andexpeditiously adjusted axially of the shaft in order to assure thecorrect positioning of the impeller within the chamber containing it.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawings accompanying this specification and in which similarreference numerals refer to similar parts,

Figure 1 is an. elevation of a portion of a centrifugal pump of thevertical type having the invention applied thereto,

Figure 2 is a transverse view taken through Figure 1 on the line 22looking in the direction indicated by the arrows, and

Figures 3 and 4 are perspective views of details of the invention.

Referring more particularly to the drawings, 20 designates a portion ofa centrifugal pump comprising a casing 21, an impeller 22 therein, and ashaft 23 for the impeller.

The impeller 22 is of the open type and in its hub 24 is a bore 25having a nice sliding fit on the shaft 23, and in the bore is a slot 26for sliding engagement with a key 21 seated in the shaft 23.

The impeller, as will be readily understood, is thus restrained againstrotary movement with respect to the shaft but is capable of movementendwise thereof. Such movement is imparted to the impeller by theadjusting and holding device designated in its entirety by 28 and which,constructed according to the invention, comprisesa holder 29 in the formof a circular plate that overlies the end of the hub 24 and is splitlongitudinally to divide it into two symmetrical members 30.

The diameter of the holder may, as illustrated, approximate that of thehub 24, and in the opposed surfaces of the members 30 are recesses 3| toaccommodate a reduced portion 32, of the shaft, defined by an annulargroove 33. The end surfaces of the members 30 seat against the adjacentends of the groove 33, and on the side of the members 30 confronting theimpeller22 are partly circular extensions 34 that extend part way intothe hub 24 and are engaged thereby for re- 2 taining the said members 30in the annular groov 33.

The portion of the holder 29 overlying the hub 24- is spaced therefrom asuitable distance to permit of movement of the impeller toward theholder, if required to place the impeller in the correct assembledposition. In diametrically opposed portions of the holder are threadedapertures 35, there being one in each of the members 30, for theaccommodation of screws 36 that are adjustable endwise of the shaft 23and have fiatted end surfaces 3'! to serve as abutments for the adjacentend surface 33 of the hub 24. Each member 30 also has a pair of holes 39to receive screws 40 that are threaded into sockets 4! in the hub 24 andserve to draw the hub firmly against the end surfaces 31 of the screws36.

In practice, whenever it is intended to assemble the holder and theimpeller on the shaft, the members 30 are first placed in the annulargroove 33 and the impeller is then positioned in such wise that the endof the hub will encircle at least the free-end portions of theextensions 34. Thereafter, the screws 36 and 40 are manipulated torespectively determine the position for the impeller on the shaft and tohold the impeller against the ends of the screws 36.

These adjustments will, of course, be made with a view toward placingthe impeller in the correct position within the impeller chamber toestablish the degree of clearance required between the open side of theimpeller and the adjacent wall of the casing for the attainment ofmaximum efficiency of the pump.

I claim: a

1. In a holding and adjusting device, a shaft, an impeller on the shaft,a holder on the shaft, means carried by the holder for effectingadjustment of the impeller axially of the shaft, and means on the holdercooperating with the impeller for retaining the holder on the shaftduring all adjusted positions of the impeller.

2. In a holding and adjusting device, a shaft, an impeller on the shaft,a holder interlockingly connected with the shaft to prevent relativeendwise movement and comprising a plurality of members, means on themembers in telescopic engagement with the impeller to retain the membersin the correct assembled relationship with each other, and means carriedby the holder for adjusting the impeller axially of the shaft to adesired position and to hold the impeller firmly in such position.

3. In a holding and adjusting device, a shaft having an external annulargroove, an impeller on the shaft, a holder seated in the annular groovecomprising a plurality of members, means on the members extending intothe impeller for retaining the members in the groove, and means carriedby the holder for adjusting the impeller axially of the shaft to adesired position and to hold the impeller firmly in such position.

4. In a holding and adjusting device, a shaft, an impeller 0n the shaft,a holder interlockingly connected with the shaft to prevent relativeendwise movement and comprising a plurality of members, means on themembers to cooperate with the impeller for retaining the members on theshaft and in the correct assembled relation ship with each other, screwsin the holder extending longitudinally of the shaft to serve as adjust-4 able abutments for the impeller, and other screws in the holder inthreaded engagement with the impeller for drawing the impeller firmlyagainst the abutments.

ALEXEY J. STEPANOFF.

REFERENCES CITED 7 The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,378,091 Carlsen May 17, 19212,278,625 Traylor et a1 Apr. 7, 1942 2,378,974 Bower June 26, 19452,407,348 Schott Sept. 10, 1946

